diff options
Diffstat (limited to 'arch/x86/platform/mrst')
| -rw-r--r-- | arch/x86/platform/mrst/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/platform/mrst/pmu.c | 817 | ||||
| -rw-r--r-- | arch/x86/platform/mrst/pmu.h | 234 |
3 files changed, 1052 insertions, 0 deletions
diff --git a/arch/x86/platform/mrst/Makefile b/arch/x86/platform/mrst/Makefile index f61ccdd49341..1ea38775a6d3 100644 --- a/arch/x86/platform/mrst/Makefile +++ b/arch/x86/platform/mrst/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_X86_MRST) += mrst.o obj-$(CONFIG_X86_MRST) += vrtc.o obj-$(CONFIG_EARLY_PRINTK_MRST) += early_printk_mrst.o +obj-$(CONFIG_X86_MRST) += pmu.o diff --git a/arch/x86/platform/mrst/pmu.c b/arch/x86/platform/mrst/pmu.c new file mode 100644 index 000000000000..9281da7d91bd --- /dev/null +++ b/arch/x86/platform/mrst/pmu.c @@ -0,0 +1,817 @@ +/* + * mrst/pmu.c - driver for MRST Power Management Unit + * + * Copyright (c) 2011, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <linux/cpuidle.h> +#include <linux/debugfs.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/seq_file.h> +#include <linux/sfi.h> +#include <asm/intel_scu_ipc.h> +#include "pmu.h" + +#define IPCMSG_FW_REVISION 0xF4 + +struct mrst_device { + u16 pci_dev_num; /* DEBUG only */ + u16 lss; + u16 latest_request; + unsigned int pci_state_counts[PCI_D3cold + 1]; /* DEBUG only */ +}; + +/* + * comlete list of MRST PCI devices + */ +static struct mrst_device mrst_devs[] = { +/* 0 */ { 0x0800, LSS_SPI0 }, /* Moorestown SPI Ctrl 0 */ +/* 1 */ { 0x0801, LSS_SPI1 }, /* Moorestown SPI Ctrl 1 */ +/* 2 */ { 0x0802, LSS_I2C0 }, /* Moorestown I2C 0 */ +/* 3 */ { 0x0803, LSS_I2C1 }, /* Moorestown I2C 1 */ +/* 4 */ { 0x0804, LSS_I2C2 }, /* Moorestown I2C 2 */ +/* 5 */ { 0x0805, LSS_KBD }, /* Moorestown Keyboard Ctrl */ +/* 6 */ { 0x0806, LSS_USB_HC }, /* Moorestown USB Ctrl */ +/* 7 */ { 0x0807, LSS_SD_HC0 }, /* Moorestown SD Host Ctrl 0 */ +/* 8 */ { 0x0808, LSS_SD_HC1 }, /* Moorestown SD Host Ctrl 1 */ +/* 9 */ { 0x0809, LSS_NAND }, /* Moorestown NAND Ctrl */ +/* 10 */ { 0x080a, LSS_AUDIO }, /* Moorestown Audio Ctrl */ +/* 11 */ { 0x080b, LSS_IMAGING }, /* Moorestown ISP */ +/* 12 */ { 0x080c, LSS_SECURITY }, /* Moorestown Security Controller */ +/* 13 */ { 0x080d, LSS_DISPLAY }, /* Moorestown External Displays */ +/* 14 */ { 0x080e, 0 }, /* Moorestown SCU IPC */ +/* 15 */ { 0x080f, LSS_GPIO }, /* Moorestown GPIO Controller */ +/* 16 */ { 0x0810, 0 }, /* Moorestown Power Management Unit */ +/* 17 */ { 0x0811, LSS_USB_OTG }, /* Moorestown OTG Ctrl */ +/* 18 */ { 0x0812, LSS_SPI2 }, /* Moorestown SPI Ctrl 2 */ +/* 19 */ { 0x0813, 0 }, /* Moorestown SC DMA */ +/* 20 */ { 0x0814, LSS_AUDIO_LPE }, /* Moorestown LPE DMA */ +/* 21 */ { 0x0815, LSS_AUDIO_SSP }, /* Moorestown SSP0 */ + +/* 22 */ { 0x084F, LSS_SD_HC2 }, /* Moorestown SD Host Ctrl 2 */ + +/* 23 */ { 0x4102, 0 }, /* Lincroft */ +/* 24 */ { 0x4110, 0 }, /* Lincroft */ +}; + +/* n.b. We ignore PCI-id 0x815 in LSS9 b/c MeeGo has no driver for it */ +static u16 mrst_lss9_pci_ids[] = {0x080a, 0x0814, 0}; +static u16 mrst_lss10_pci_ids[] = {0x0800, 0x0801, 0x0802, 0x0803, + 0x0804, 0x0805, 0x080f, 0}; + +/* handle concurrent SMP invokations of pmu_pci_set_power_state() */ +static spinlock_t mrst_pmu_power_state_lock; + +static unsigned int wake_counters[MRST_NUM_LSS]; /* DEBUG only */ +static unsigned int pmu_irq_stats[INT_INVALID + 1]; /* DEBUG only */ + +static int graphics_is_off; +static int lss_s0i3_enabled; +static bool mrst_pmu_s0i3_enable; + +/* debug counters */ +static u32 pmu_wait_ready_calls; +static u32 pmu_wait_ready_udelays; +static u32 pmu_wait_ready_udelays_max; +static u32 pmu_wait_done_calls; +static u32 pmu_wait_done_udelays; +static u32 pmu_wait_done_udelays_max; +static u32 pmu_set_power_state_entry; +static u32 pmu_set_power_state_send_cmd; + +static struct mrst_device *pci_id_2_mrst_dev(u16 pci_dev_num) +{ + int index = 0; + + if ((pci_dev_num >= 0x0800) && (pci_dev_num <= 0x815)) + index = pci_dev_num - 0x800; + else if (pci_dev_num == 0x084F) + index = 22; + else if (pci_dev_num == 0x4102) + index = 23; + else if (pci_dev_num == 0x4110) + index = 24; + + if (pci_dev_num != mrst_devs[index].pci_dev_num) { + WARN_ONCE(1, FW_BUG "Unknown PCI device 0x%04X\n", pci_dev_num); + return 0; + } + + return &mrst_devs[index]; +} + +/** + * mrst_pmu_validate_cstates + * @dev: cpuidle_device + * + * Certain states are not appropriate for governor to pick in some cases. + * This function will be called as cpuidle_device's prepare callback and + * thus tells governor to ignore such states when selecting the next state + * to enter. + */ + +#define IDLE_STATE4_IS_C6 4 +#define IDLE_STATE5_IS_S0I3 5 + +int mrst_pmu_invalid_cstates(void) +{ + int cpu = smp_processor_id(); + + /* + * Demote to C4 if the PMU is busy. + * Since LSS changes leave the busy bit clear... + * busy means either the PMU is waiting for an ACK-C6 that + * isn't coming due to an MWAIT that returned immediately; + * or we returned from S0i3 successfully, and the PMU + * is not done sending us interrupts. + */ + if (pmu_read_busy_status()) + return 1 << IDLE_STATE4_IS_C6 | 1 << IDLE_STATE5_IS_S0I3; + + /* + * Disallow S0i3 if: PMU is not initialized, or CPU1 is active, + * or if device LSS is insufficient, or the GPU is active, + * or if it has been explicitly disabled. + */ + if (!pmu_reg || !cpumask_equal(cpu_online_mask, cpumask_of(cpu)) || + !lss_s0i3_enabled || !graphics_is_off || !mrst_pmu_s0i3_enable) + return 1 << IDLE_STATE5_IS_S0I3; + else + return 0; +} + +/* + * pmu_update_wake_counters(): read PM_WKS, update wake_counters[] + * DEBUG only. + */ +static void pmu_update_wake_counters(void) +{ + int lss; + u32 wake_status; + + wake_status = pmu_read_wks(); + + for (lss = 0; lss < MRST_NUM_LSS; ++lss) { + if (wake_status & (1 << lss)) + wake_counters[lss]++; + } +} + +int mrst_pmu_s0i3_entry(void) +{ + int status; + + /* Clear any possible error conditions */ + pmu_write_ics(0x300); + + /* set wake control to current D-states */ + pmu_write_wssc(S0I3_SSS_TARGET); + + status = mrst_s0i3_entry(PM_S0I3_COMMAND, &pmu_reg->pm_cmd); + pmu_update_wake_counters(); + return status; +} + +/* poll for maximum of 5ms for busy bit to clear */ +static int pmu_wait_ready(void) +{ + int udelays; + + pmu_wait_ready_calls++; + + for (udelays = 0; udelays < 500; ++udelays) { + if (udelays > pmu_wait_ready_udelays_max) + pmu_wait_ready_udelays_max = udelays; + + if (pmu_read_busy_status() == 0) + return 0; + + udelay(10); + pmu_wait_ready_udelays++; + } + + /* + * if this fires, observe + * /sys/kernel/debug/mrst_pmu_wait_ready_calls + * /sys/kernel/debug/mrst_pmu_wait_ready_udelays + */ + WARN_ONCE(1, "SCU not ready for 5ms"); + return -EBUSY; +} +/* poll for maximum of 50ms us for busy bit to clear */ +static int pmu_wait_done(void) +{ + int udelays; + + pmu_wait_done_calls++; + + for (udelays = 0; udelays < 500; ++udelays) { + if (udelays > pmu_wait_done_udelays_max) + pmu_wait_done_udelays_max = udelays; + + if (pmu_read_busy_status() == 0) + return 0; + + udelay(100); + pmu_wait_done_udelays++; + } + + /* + * if this fires, observe + * /sys/kernel/debug/mrst_pmu_wait_done_calls + * /sys/kernel/debug/mrst_pmu_wait_done_udelays + */ + WARN_ONCE(1, "SCU not done for 50ms"); + return -EBUSY; +} + +u32 mrst_pmu_msi_is_disabled(void) +{ + return pmu_msi_is_disabled(); +} + +void mrst_pmu_enable_msi(void) +{ + pmu_msi_enable(); +} + +/** + * pmu_irq - pmu driver interrupt handler + * Context: interrupt context + */ +static irqreturn_t pmu_irq(int irq, void *dummy) +{ + union pmu_pm_ics pmu_ics; + + pmu_ics.value = pmu_read_ics(); + + if (!pmu_ics.bits.pending) + return IRQ_NONE; + + switch (pmu_ics.bits.cause) { + case INT_SPURIOUS: + case INT_CMD_DONE: + case INT_CMD_ERR: + case INT_WAKE_RX: + case INT_SS_ERROR: + case INT_S0IX_MISS: + case INT_NO_ACKC6: + pmu_irq_stats[pmu_ics.bits.cause]++; + break; + default: + pmu_irq_stats[INT_INVALID]++; + } + + pmu_write_ics(pmu_ics.value); /* Clear pending interrupt */ + + return IRQ_HANDLED; +} + +/* + * Translate PCI power management to MRST LSS D-states + */ +static int pci_2_mrst_state(int lss, pci_power_t pci_state) +{ + switch (pci_state) { + case PCI_D0: + if (SSMSK(D0i1, lss) & D0I1_ACG_SSS_TARGET) + return D0i1; + else + return D0; + case PCI_D1: + return D0i1; + case PCI_D2: + return D0i2; + case PCI_D3hot: + case PCI_D3cold: + return D0i3; + default: + WARN(1, "pci_state %d\n", pci_state); + return 0; + } +} + +static int pmu_issue_command(u32 pm_ssc) +{ + union pmu_pm_set_cfg_cmd_t command; + + if (pmu_read_busy_status()) { + pr_debug("pmu is busy, Operation not permitted\n"); + return -1; + } + + /* + * enable interrupts in PMU so that interrupts are + * propagated when ioc bit for a particular set + * command is set + */ + + pmu_irq_enable(); + + /* Configure the sub systems for pmu2 */ + + pmu_write_ssc(pm_ssc); + + /* + * Send the set config command for pmu its configured + * for mode CM_IMMEDIATE & hence with No Trigger + */ + + command.pmu2_params.d_param.cfg_mode = CM_IMMEDIATE; + command.pmu2_params.d_param.cfg_delay = 0; + command.pmu2_params.d_param.rsvd = 0; + + /* construct the command to send SET_CFG to particular PMU */ + command.pmu2_params.d_param.cmd = SET_CFG_CMD; + command.pmu2_params.d_param.ioc = 0; + command.pmu2_params.d_param.mode_id = 0; + command.pmu2_params.d_param.sys_state = SYS_STATE_S0I0; + + /* write the value of PM_CMD into particular PMU */ + pr_debug("pmu command being written %x\n", + command.pmu_pm_set_cfg_cmd_value); + + pmu_write_cmd(command.pmu_pm_set_cfg_cmd_value); + + return 0; +} + +static u16 pmu_min_lss_pci_req(u16 *ids, u16 pci_state) +{ + u16 existing_request; + int i; + + for (i = 0; ids[i]; ++i) { + struct mrst_device *mrst_dev; + + mrst_dev = pci_id_2_mrst_dev(ids[i]); + if (unlikely(!mrst_dev)) + continue; + + existing_request = mrst_dev->latest_request; + if (existing_request < pci_state) + pci_state = existing_request; + } + return pci_state; +} + +/** + * pmu_pci_set_power_state - Callback function is used by all the PCI devices + * for a platform specific device power on/shutdown. + */ + +int pmu_pci_set_power_state(struct pci_dev *pdev, pci_power_t pci_state) +{ + u32 old_sss, new_sss; + int status = 0; + struct mrst_device *mrst_dev; + + pmu_set_power_state_entry++; + + BUG_ON(pdev->vendor != PCI_VENDOR_ID_INTEL); + BUG_ON(pci_state < PCI_D0 || pci_state > PCI_D3cold); + + mrst_dev = pci_id_2_mrst_dev(pdev->device); + if (unlikely(!mrst_dev)) + return -ENODEV; + + mrst_dev->pci_state_counts[pci_state]++; /* count invocations */ + + /* PMU driver calls self as part of PCI initialization, ignore */ + if (pdev->device == PCI_DEV_ID_MRST_PMU) + return 0; + + BUG_ON(!pmu_reg); /* SW bug if called before initialized */ + + spin_lock(&mrst_pmu_power_state_lock); + + if (pdev->d3_delay) { + dev_dbg(&pdev->dev, "d3_delay %d, should be 0\n", + pdev->d3_delay); + pdev->d3_delay = 0; + } + /* + * If Lincroft graphics, simply remember state + */ + if ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY + && !((pdev->class & PCI_SUB_CLASS_MASK) >> 8)) { + if (pci_state == PCI_D0) + graphics_is_off = 0; + else + graphics_is_off = 1; + goto ret; + } + + if (!mrst_dev->lss) + goto ret; /* device with no LSS */ + + if (mrst_dev->latest_request == pci_state) + goto ret; /* no change */ + + mrst_dev->latest_request = pci_state; /* record latest request */ + + /* + * LSS9 and LSS10 contain multiple PCI devices. + * Use the lowest numbered (highest power) state in the LSS + */ + if (mrst_dev->lss == 9) + pci_state = pmu_min_lss_pci_req(mrst_lss9_pci_ids, pci_state); + else if (mrst_dev->lss == 10) + pci_state = pmu_min_lss_pci_req(mrst_lss10_pci_ids, pci_state); + + status = pmu_wait_ready(); + if (status) + goto ret; + + old_sss = pmu_read_sss(); + new_sss = old_sss & ~SSMSK(3, mrst_dev->lss); + new_sss |= SSMSK(pci_2_mrst_state(mrst_dev->lss, pci_state), + mrst_dev->lss); + + if (new_sss == old_sss) + goto ret; /* nothing to do */ + + pmu_set_power_state_send_cmd++; + + status = pmu_issue_command(new_sss); + + if (unlikely(status != 0)) { + dev_err(&pdev->dev, "Failed to Issue a PM command\n"); + goto ret; + } + + if (pmu_wait_done()) + goto ret; + + lss_s0i3_enabled = + ((pmu_read_sss() & S0I3_SSS_TARGET) == S0I3_SSS_TARGET); +ret: + spin_unlock(&mrst_pmu_power_state_lock); + return status; +} + +#ifdef CONFIG_DEBUG_FS +static char *d0ix_names[] = {"D0", "D0i1", "D0i2", "D0i3"}; + +static inline const char *d0ix_name(int state) +{ + return d0ix_names[(int) state]; +} + +static int debug_mrst_pmu_show(struct seq_file *s, void *unused) +{ + struct pci_dev *pdev = NULL; + u32 cur_pmsss; + int lss; + + seq_printf(s, "0x%08X D0I1_ACG_SSS_TARGET\n", D0I1_ACG_SSS_TARGET); + + cur_pmsss = pmu_read_sss(); + + seq_printf(s, "0x%08X S0I3_SSS_TARGET\n", S0I3_SSS_TARGET); + + seq_printf(s, "0x%08X Current SSS ", cur_pmsss); + seq_printf(s, lss_s0i3_enabled ? "\n" : "[BLOCKS s0i3]\n"); + + if (cpumask_equal(cpu_online_mask, cpumask_of(0))) + seq_printf(s, "cpu0 is only cpu online\n"); + else + seq_printf(s, "cpu0 is NOT only cpu online [BLOCKS S0i3]\n"); + + seq_printf(s, "GFX: %s\n", graphics_is_off ? "" : "[BLOCKS s0i3]"); + + + for_each_pci_dev(pdev) { + int pos; + u16 pmcsr; + struct mrst_device *mrst_dev; + int i; + + mrst_dev = pci_id_2_mrst_dev(pdev->device); + + seq_printf(s, "%s %04x/%04X %-16.16s ", + dev_name(&pdev->dev), + pdev->vendor, pdev->device, + dev_driver_string(&pdev->dev)); + + if (unlikely (!mrst_dev)) { + seq_printf(s, " UNKNOWN\n"); + continue; + } + + if (mrst_dev->lss) + seq_printf(s, "LSS %2d %-4s ", mrst_dev->lss, + d0ix_name(((cur_pmsss >> + (mrst_dev->lss * 2)) & 0x3))); + else + seq_printf(s, " "); + + /* PCI PM config space setting */ + pos = pci_find_capability(pdev, PCI_CAP_ID_PM); + if (pos != 0) { + pci_read_config_word(pdev, pos + PCI_PM_CTRL, &pmcsr); + seq_printf(s, "PCI-%-4s", + pci_power_name(pmcsr & PCI_PM_CTRL_STATE_MASK)); + } else { + seq_printf(s, " "); + } + + seq_printf(s, " %s ", pci_power_name(mrst_dev->latest_request)); + for (i = 0; i <= PCI_D3cold; ++i) + seq_printf(s, "%d ", mrst_dev->pci_state_counts[i]); + + if (mrst_dev->lss) { + unsigned int lssmask; + + lssmask = SSMSK(D0i3, mrst_dev->lss); + + if ((lssmask & S0I3_SSS_TARGET) && + ((lssmask & cur_pmsss) != + (lssmask & S0I3_SSS_TARGET))) + seq_printf(s , "[BLOCKS s0i3]"); + } + + seq_printf(s, "\n"); + } + seq_printf(s, "Wake Counters:\n"); + for (lss = 0; lss < MRST_NUM_LSS; ++lss) + seq_printf(s, "LSS%d %d\n", lss, wake_counters[lss]); + + seq_printf(s, "Interrupt Counters:\n"); + seq_printf(s, + "INT_SPURIOUS \t%8u\n" "INT_CMD_DONE \t%8u\n" + "INT_CMD_ERR \t%8u\n" "INT_WAKE_RX \t%8u\n" + "INT_SS_ERROR \t%8u\n" "INT_S0IX_MISS\t%8u\n" + "INT_NO_ACKC6 \t%8u\n" "INT_INVALID \t%8u\n", + pmu_irq_stats[INT_SPURIOUS], pmu_irq_stats[INT_CMD_DONE], + pmu_irq_stats[INT_CMD_ERR], pmu_irq_stats[INT_WAKE_RX], + pmu_irq_stats[INT_SS_ERROR], pmu_irq_stats[INT_S0IX_MISS], + pmu_irq_stats[INT_NO_ACKC6], pmu_irq_stats[INT_INVALID]); + + seq_printf(s, "mrst_pmu_wait_ready_calls %8d\n", + pmu_wait_ready_calls); + seq_printf(s, "mrst_pmu_wait_ready_udelays %8d\n", + pmu_wait_ready_udelays); + seq_printf(s, "mrst_pmu_wait_ready_udelays_max %8d\n", + pmu_wait_ready_udelays_max); + seq_printf(s, "mrst_pmu_wait_done_calls %8d\n", + pmu_wait_done_calls); + seq_printf(s, "mrst_pmu_wait_done_udelays %8d\n", + pmu_wait_done_udelays); + seq_printf(s, "mrst_pmu_wait_done_udelays_max %8d\n", + pmu_wait_done_udelays_max); + seq_printf(s, "mrst_pmu_set_power_state_entry %8d\n", + pmu_set_power_state_entry); + seq_printf(s, "mrst_pmu_set_power_state_send_cmd %8d\n", + pmu_set_power_state_send_cmd); + seq_printf(s, "SCU busy: %d\n", pmu_read_busy_status()); + + return 0; +} + +static int debug_mrst_pmu_open(struct inode *inode, struct file *file) +{ + return single_open(file, debug_mrst_pmu_show, NULL); +} + +static const struct file_operations devices_state_operations = { + .open = debug_mrst_pmu_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; +#endif /* DEBUG_FS */ + +/* + * Validate SCU PCI shim PCI vendor capability byte + * against LSS hard-coded in mrst_devs[] above. + * DEBUG only. + */ +static void pmu_scu_firmware_debug(void) +{ + struct pci_dev *pdev = NULL; + + for_each_pci_dev(pdev) { + struct mrst_device *mrst_dev; + u8 pci_config_lss; + int pos; + + mrst_dev = pci_id_2_mrst_dev(pdev->device); + if (unlikely(!mrst_dev)) { + printk(KERN_ERR FW_BUG "pmu: Unknown " + "PCI device 0x%04X\n", pdev->device); + continue; + } + + if (mrst_dev->lss == 0) + continue; /* no LSS in our table */ + + pos = pci_find_capability(pdev, PCI_CAP_ID_VNDR); + if (!pos != 0) { + printk(KERN_ERR FW_BUG "pmu: 0x%04X " + "missing PCI Vendor Capability\n", + pdev->device); + continue; + } + pci_read_config_byte(pdev, pos + 4, &pci_config_lss); + if (!(pci_config_lss & PCI_VENDOR_CAP_LOG_SS_MASK)) { + printk(KERN_ERR FW_BUG "pmu: 0x%04X " + "invalid PCI Vendor Capability 0x%x " + " expected LSS 0x%X\n", + pdev->device, pci_config_lss, mrst_dev->lss); + continue; + } + pci_config_lss &= PCI_VENDOR_CAP_LOG_ID_MASK; + + if (mrst_dev->lss == pci_config_lss) + continue; + + printk(KERN_ERR FW_BUG "pmu: 0x%04X LSS = %d, expected %d\n", + pdev->device, pci_config_lss, mrst_dev->lss); + } +} + +/** + * pmu_probe + */ +static int __devinit pmu_probe(struct pci_dev *pdev, + const struct pci_device_id *pci_id) +{ + int ret; + struct mrst_pmu_reg *pmu; + + /* Init the device */ + ret = pci_enable_device(pdev); + if (ret) { + dev_err(&pdev->dev, "Unable to Enable PCI device\n"); + return ret; + } + + ret = pci_request_regions(pdev, MRST_PMU_DRV_NAME); + if (ret < 0) { + dev_err(&pdev->dev, "Cannot obtain PCI resources, aborting\n"); + goto out_err1; + } + + /* Map the memory of PMU reg base */ + pmu = pci_iomap(pdev, 0, 0); + if (!pmu) { + dev_err(&pdev->dev, "Unable to map the PMU address space\n"); + ret = -ENOMEM; + goto out_err2; + } + +#ifdef CONFIG_DEBUG_FS + /* /sys/kernel/debug/mrst_pmu */ + (void) debugfs_create_file("mrst_pmu", S_IFREG | S_IRUGO, + NULL, NULL, &devices_state_operations); +#endif + pmu_reg = pmu; /* success */ + + if (request_irq(pdev->irq, pmu_irq, 0, MRST_PMU_DRV_NAME, NULL)) { + dev_err(&pdev->dev, "Registering isr has failed\n"); + ret = -1; + goto out_err3; + } + + pmu_scu_firmware_debug(); + + pmu_write_wkc(S0I3_WAKE_SOURCES); /* Enable S0i3 wakeup sources */ + + pmu_wait_ready(); + + pmu_write_ssc(D0I1_ACG_SSS_TARGET); /* Enable Auto-Clock_Gating */ + pmu_write_cmd(0x201); + + spin_lock_init(&mrst_pmu_power_state_lock); + + /* Enable the hardware interrupt */ + pmu_irq_enable(); + return 0; + +out_err3: + free_irq(pdev->irq, NULL); + pci_iounmap(pdev, pmu_reg); + pmu_reg = NULL; +out_err2: + pci_release_region(pdev, 0); +out_err1: + pci_disable_device(pdev); + return ret; +} + +static void __devexit pmu_remove(struct pci_dev *pdev) +{ + dev_err(&pdev->dev, "Mid PM pmu_remove called\n"); + + /* Freeing up the irq */ + free_irq(pdev->irq, NULL); + + pci_iounmap(pdev, pmu_reg); + pmu_reg = NULL; + + /* disable the current PCI device */ + pci_release_region(pdev, 0); + pci_disable_device(pdev); +} + +static DEFINE_PCI_DEVICE_TABLE(pmu_pci_ids) = { + { PCI_VDEVICE(INTEL, PCI_DEV_ID_MRST_PMU), 0 }, + { } +}; + +MODULE_DEVICE_TABLE(pci, pmu_pci_ids); + +static struct pci_driver driver = { + .name = MRST_PMU_DRV_NAME, + .id_table = pmu_pci_ids, + .probe = pmu_probe, + .remove = __devexit_p(pmu_remove), +}; + +/** + * pmu_pci_register - register the PMU driver as PCI device + */ +static int __init pmu_pci_register(void) +{ + return pci_register_driver(&driver); +} + +/* Register and probe via fs_initcall() to preceed device_initcall() */ +fs_initcall(pmu_pci_register); + +static void __exit mid_pci_cleanup(void) +{ + pci_unregister_driver(&driver); +} + +static int ia_major; +static int ia_minor; + +static int pmu_sfi_parse_oem(struct sfi_table_header *table) +{ + struct sfi_table_simple *sb; + + sb = (struct sfi_table_simple *)table; + ia_major = (sb->pentry[1] >> 0) & 0xFFFF; + ia_minor = (sb->pentry[1] >> 16) & 0xFFFF; + printk(KERN_INFO "mrst_pmu: IA FW version v%x.%x\n", + ia_major, ia_minor); + + return 0; +} + +static int __init scu_fw_check(void) +{ + int ret; + u32 fw_version; + + if (!pmu_reg) + return 0; /* this driver didn't probe-out */ + + sfi_table_parse("OEMB", NULL, NULL, pmu_sfi_parse_oem); + + if (ia_major < 0x6005 || ia_minor < 0x1525) { + WARN(1, "mrst_pmu: IA FW version too old\n"); + return -1; + } + + ret = intel_scu_ipc_command(IPCMSG_FW_REVISION, 0, NULL, 0, + &fw_version, 1); + + if (ret) { + WARN(1, "mrst_pmu: IPC FW version? %d\n", ret); + } else { + int scu_major = (fw_version >> 8) & 0xFF; + int scu_minor = (fw_version >> 0) & 0xFF; + + printk(KERN_INFO "mrst_pmu: firmware v%x\n", fw_version); + + if ((scu_major >= 0xC0) && (scu_minor >= 0x49)) { + printk(KERN_INFO "mrst_pmu: enabling S0i3\n"); + mrst_pmu_s0i3_enable = true; + } else { + WARN(1, "mrst_pmu: S0i3 disabled, old firmware %X.%X", + scu_major, scu_minor); + } + } + return 0; +} +late_initcall(scu_fw_check); +module_exit(mid_pci_cleanup); diff --git a/arch/x86/platform/mrst/pmu.h b/arch/x86/platform/mrst/pmu.h new file mode 100644 index 000000000000..bfbfe64b167b --- /dev/null +++ b/arch/x86/platform/mrst/pmu.h @@ -0,0 +1,234 @@ +/* + * mrst/pmu.h - private definitions for MRST Power Management Unit mrst/pmu.c + * + * Copyright (c) 2011, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef _MRST_PMU_H_ +#define _MRST_PMU_H_ + +#define PCI_DEV_ID_MRST_PMU 0x0810 +#define MRST_PMU_DRV_NAME "mrst_pmu" +#define PCI_SUB_CLASS_MASK 0xFF00 + +#define PCI_VENDOR_CAP_LOG_ID_MASK 0x7F +#define PCI_VENDOR_CAP_LOG_SS_MASK 0x80 + +#define SUB_SYS_ALL_D0I1 0x01155555 +#define S0I3_WAKE_SOURCES 0x00001FFF + +#define PM_S0I3_COMMAND \ + ((0 << 31) | /* Reserved */ \ + (0 << 30) | /* Core must be idle */ \ + (0xc2 << 22) | /* ACK C6 trigger */ \ + (3 << 19) | /* Trigger on DMI message */ \ + (3 << 16) | /* Enter S0i3 */ \ + (0 << 13) | /* Numeric mode ID (sw) */ \ + (3 << 9) | /* Trigger mode */ \ + (0 << 8) | /* Do not interrupt */ \ + (1 << 0)) /* Set configuration */ + +#define LSS_DMI 0 +#define LSS_SD_HC0 1 +#define LSS_SD_HC1 2 +#define LSS_NAND 3 +#define LSS_IMAGING 4 +#define LSS_SECURITY 5 +#define LSS_DISPLAY 6 +#define LSS_USB_HC 7 +#define LSS_USB_OTG 8 +#define LSS_AUDIO 9 +#define LSS_AUDIO_LPE 9 +#define LSS_AUDIO_SSP 9 +#define LSS_I2C0 10 +#define LSS_I2C1 10 +#define LSS_I2C2 10 +#define LSS_KBD 10 +#define LSS_SPI0 10 +#define LSS_SPI1 10 +#define LSS_SPI2 10 +#define LSS_GPIO 10 +#define LSS_SRAM 11 /* used by SCU, do not touch */ +#define LSS_SD_HC2 12 +/* LSS hardware bits 15,14,13 are hardwired to 0, thus unusable */ +#define MRST_NUM_LSS 13 + +#define MIN(a, b) (((a) < (b)) ? (a) : (b)) + +#define SSMSK(mask, lss) ((mask) << ((lss) * 2)) +#define D0 0 +#define D0i1 1 +#define D0i2 2 +#define D0i3 3 + +#define S0I3_SSS_TARGET ( \ + SSMSK(D0i1, LSS_DMI) | \ + SSMSK(D0i3, LSS_SD_HC0) | \ + SSMSK(D0i3, LSS_SD_HC1) | \ + SSMSK(D0i3, LSS_NAND) | \ + SSMSK(D0i3, LSS_SD_HC2) | \ + SSMSK(D0i3, LSS_IMAGING) | \ + SSMSK(D0i3, LSS_SECURITY) | \ + SSMSK(D0i3, LSS_DISPLAY) | \ + SSMSK(D0i3, LSS_USB_HC) | \ + SSMSK(D0i3, LSS_USB_OTG) | \ + SSMSK(D0i3, LSS_AUDIO) | \ + SSMSK(D0i1, LSS_I2C0)) + +/* + * D0i1 on Langwell is Autonomous Clock Gating (ACG). + * Enable ACG on every LSS except camera and audio + */ +#define D0I1_ACG_SSS_TARGET \ + (SUB_SYS_ALL_D0I1 & ~SSMSK(D0i1, LSS_IMAGING) & ~SSMSK(D0i1, LSS_AUDIO)) + +enum cm_mode { + CM_NOP, /* ignore the config mode value */ + CM_IMMEDIATE, + CM_DELAY, + CM_TRIGGER, + CM_INVALID +}; + +enum sys_state { + SYS_STATE_S0I0, + SYS_STATE_S0I1, + SYS_STATE_S0I2, + SYS_STATE_S0I3, + SYS_STATE_S3, + SYS_STATE_S5 +}; + +#define SET_CFG_CMD 1 + +enum int_status { + INT_SPURIOUS = 0, + INT_CMD_DONE = 1, + INT_CMD_ERR = 2, + INT_WAKE_RX = 3, + INT_SS_ERROR = 4, + INT_S0IX_MISS = 5, + INT_NO_ACKC6 = 6, + INT_INVALID = 7, +}; + +/* PMU register interface */ +static struct mrst_pmu_reg { + u32 pm_sts; /* 0x00 */ + u32 pm_cmd; /* 0x04 */ + u32 pm_ics; /* 0x08 */ + u32 _resv1; /* 0x0C */ + u32 pm_wkc[2]; /* 0x10 */ + u32 pm_wks[2]; /* 0x18 */ + u32 pm_ssc[4]; /* 0x20 */ + u32 pm_sss[4]; /* 0x30 */ + u32 pm_wssc[4]; /* 0x40 */ + u32 pm_c3c4; /* 0x50 */ + u32 pm_c5c6; /* 0x54 */ + u32 pm_msi_disable; /* 0x58 */ +} *pmu_reg; + +static inline u32 pmu_read_sts(void) { return readl(&pmu_reg->pm_sts); } +static inline u32 pmu_read_ics(void) { return readl(&pmu_reg->pm_ics); } +static inline u32 pmu_read_wks(void) { return readl(&pmu_reg->pm_wks[0]); } +static inline u32 pmu_read_sss(void) { return readl(&pmu_reg->pm_sss[0]); } + +static inline void pmu_write_cmd(u32 arg) { writel(arg, &pmu_reg->pm_cmd); } +static inline void pmu_write_ics(u32 arg) { writel(arg, &pmu_reg->pm_ics); } +static inline void pmu_write_wkc(u32 arg) { writel(arg, &pmu_reg->pm_wkc[0]); } +static inline void pmu_write_ssc(u32 arg) { writel(arg, &pmu_reg->pm_ssc[0]); } +static inline void pmu_write_wssc(u32 arg) + { writel(arg, &pmu_reg->pm_wssc[0]); } + +static inline void pmu_msi_enable(void) { writel(0, &pmu_reg->pm_msi_disable); } +static inline u32 pmu_msi_is_disabled(void) + { return readl(&pmu_reg->pm_msi_disable); } + +union pmu_pm_ics { + struct { + u32 cause:8; + u32 enable:1; + u32 pending:1; + u32 reserved:22; + } bits; + u32 value; +}; + +static inline void pmu_irq_enable(void) +{ + union pmu_pm_ics pmu_ics; + + pmu_ics.value = pmu_read_ics(); + pmu_ics.bits.enable = 1; + pmu_write_ics(pmu_ics.value); +} + +union pmu_pm_status { + struct { + u32 pmu_rev:8; + u32 pmu_busy:1; + u32 mode_id:4; + u32 Reserved:19; + } pmu_status_parts; + u32 pmu_status_value; +}; + +static inline int pmu_read_busy_status(void) +{ + union pmu_pm_status result; + + result.pmu_status_value = pmu_read_sts(); + + return result.pmu_status_parts.pmu_busy; +} + +/* pmu set config parameters */ +struct cfg_delay_param_t { + u32 cmd:8; + u32 ioc:1; + u32 cfg_mode:4; + u32 mode_id:3; + u32 sys_state:3; + u32 cfg_delay:8; + u32 rsvd:5; +}; + +struct cfg_trig_param_t { + u32 cmd:8; + u32 ioc:1; + u32 cfg_mode:4; + u32 mode_id:3; + u32 sys_state:3; + u32 cfg_trig_type:3; + u32 cfg_trig_val:8; + u32 cmbi:1; + u32 rsvd1:1; +}; + +union pmu_pm_set_cfg_cmd_t { + union { + struct cfg_delay_param_t d_param; + struct cfg_trig_param_t t_param; + } pmu2_params; + u32 pmu_pm_set_cfg_cmd_value; +}; + +#ifdef FUTURE_PATCH +extern int mrst_s0i3_entry(u32 regval, u32 *regaddr); +#else +static inline int mrst_s0i3_entry(u32 regval, u32 *regaddr) { return -1; } +#endif +#endif |